Synergistic Effect of Abamectin and Neem Oil Against Panonychus citri Me Gregor

Toxicity of abamectin and neem oil against Panonychus citri and the synergistic effect of their mixture were evaluated in the lab.It was showed that,for the contact toxicity of abamectin and neem oil to adult famales of Panonychus citri,the LC50 value was 0.01 μg/mL and 6 579.87 μg/mL,respectively,after 24 h treatment.The optimal mixture ratio of abamectin with neem oil was determined by co-toxicity factor and co-toxicity coefficient method.The results indicated that,among the 6 combinations of theses two active ingredients,the co-toxicity factor of combination at the ratios of 1 ∶ 100 and 1 ∶ 125 for abamectin vs neem oil was 24.50 and 31.08,respectively.Furthermore,combination at the ratio of 1 ∶ 125 showed the highest synergism with a co-toxicity coefficient of 160.76.